Grub display menu install#
Grub display menu drivers#
Grub display menu driver#
Grub display menu manual#
Grub display menu code#

The current driver and cards are best configured with GRUB_GFXMODE in the standard widthx heightx depth format.

Pascal cards with more recent drivers (tested with GeForce GTX 1060 and nvidia 381.22) will not work with the suggested format and attempting to use it results in serious issues, including but not limited to system crashes and hard locks. This does not appear to apply to newer cards and drivers. Earlier versions of the NVIDIA proprietary driver (tested with GeForce GTX 970, driver: nvidia 370) accepts GRUB_GFXMODE in format widthx height- depth (e.g.Alternatively, enter the GRUB command line and run the command videoinfo.

To view the list of supported modes, install hwinfo and run hwinfo -framebuffer as root. Only the modes supported by the graphics card via VESA BIOS Extensions can be used.The gfxpayload property will make sure the kernel keeps the resolution. For more information, refer to the GRUB gfxmode documentation. Multiple resolutions can be specified, including the default auto, so it is recommended that you edit the line to resemble GRUB_GFXMODE= desired_resolution, fallback_such_as_1024x768,auto. The preferred method is editing /etc/default/grub to set width (pixels) x height (pixels) x color depth: GRUB can set the framebuffer for both GRUB itself ( GFXMODE) and the kernel ( GFXPAYLOAD). Make sure to initialize the GRUB graphical terminal, gfxterm, in /etc/default/grub: In GRUB it is possible, by default, to change the look of the menu. grub-customizer - GTK customizer for GRUB or BURG.You can then chainload GRUB's core.img from GRUB Legacy or syslinux as a Linux kernel or as a multiboot kernel (see also Syslinux#Chainloading). # grub-install -target=i386-pc -grub-setup=/bin/true -debug /dev/sda

To populate the /boot/grub directory and generate a /boot/grub/i386-pc/core.img file without embedding any GRUB bootsector code in the MBR, post-MBR region, or the partition bootsector, add -grub-setup=/bin/true to grub-install: # mount /dev/sdxZ /mnt/boot #Your boot partition (if you have one). # mount /dev/sdxY /mnt #Your root partition. In order to fix this issue the following commands: Unfortunately, the grub.cfg file that is created will not contain the proper UUID in order to boot, even if it reports no errors. The immutable flag on /boot/grub/i386-pc/core.img needs to be set only if GRUB is installed to a partition boot sector or a partitionless disk, not in case of installation to MBR or simple generation of core.img without embedding any bootsector (mentioned above).

The workaround for this is to set the immutable flag on /boot/grub/i386-pc/core.img (using chattr command as mentioned above) so that the sector locations of the core.img file in the disk is not altered. The sector locations of core.img may change whenever the file system in the partition is being altered (files copied, deleted etc.). The reason why grub-setup does not by default allow this is because in case of partition or a partitionless disk is that GRUB relies on embedded blocklists in the partition bootsector to locate the /boot/grub/i386-pc/core.img file and the prefix directory /boot/grub.

sbin/grub-setup: error: will not proceed with blocklists Without -force you may get the below error and grub-setup will not setup its boot code in the partition boot sector: However, blocklists are UNRELIABLE and their use is discouraged. GRUB can only be installed in this setup by using blocklists. sbin/grub-setup: warn: Embedding is not possible. sbin/grub-setup: warn: Attempting to install GRUB to a partitionless disk or to a partition. Grub-install will give out warnings like which should give you the idea of what might go wrong with this approach: You need to use the -force option to allow usage of blocklists and should not use -grub-setup=/bin/true (which is similar to simply generating core.img). It is recommended to always use this option to remove ambiguity in grub-install.

-target=i386-pc instructs grub-install to install for BIOS systems only.

Install to partition or partitionless disk To have grub write its EFI image to esp/EFI/BOOT/BOOTX64.efi, which the boot firmware will be able to find without any UEFI boot entry, use -removable when you run grub-install. # cp /etc/default/grub /mnt/usb/etc/default Optionally backup configuration files of grub.cfg: # grub-mkconfig -o /mnt/usb/boot/grub/grub.cfg # grub-install -target=i386-pc -debug -boot-directory=/mnt/usb/boot /dev/sdy

10 Manual configuration of core image for early bootĪlternative installation methods Install to external USB stick BIOSĪssume your USB stick's first partition is FAT32 and its partition is /dev/sdy1.

7 Combining the use of UUIDs and basic scripting.

6 Hide GRUB unless the Shift key is held down.

5.1 Password protection of GRUB edit and console options only.

4 Booting ISO9660 image file directly via GRUB.

1.2 Install to partition or partitionless disk.

Grub display menu drivers#

Grub display menu install#

Grub display menu code#

Grub display menu manual#